package com.gz.mylife.widget;

import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.gz.mylife.Define;
import com.gz.mylife.R;
import com.zl.smartmall.library.util.CrashHandler;
import com.zl.smartmall.library.util.Tools;


public class PullToRefreshListView extends ListView implements OnScrollListener {
	private static final String TAG = "PullToRefreshListView";
	private static final int REFRESH_HINT_APPEAR_MILLIS = 1 * 1000;//毫秒
	private final static int RELEASE_To_REFRESH = 0;
	private final static int PULL_To_REFRESH = 1;
	private final static int REFRESHING = 2;
	private final static int DONE = 3;
	private final static int LOADING = 4;
	// 实际的padding的距离与界面上偏移距离的比例
	private final static int RATIO = 3;

	private int headContentWidth;
	private int headContentHeight;

	private LinearLayout innerLayout;
	private LinearLayout headView;
	private ImageView arrowImageView;
	private ProgressBar progressBar;
	private TextView tipsTextview;
	private TextView lastUpdatedTextView;
	private ImageView mReleaseHintIcon;
	private OnRefreshListener refreshListener;
	private OnLastItemVisibleListener mOnLastItemVisibleListener;
	private boolean mLastItemVisible;
	private boolean isRefreshable;
	private boolean isRefreshing;//当前是否正在刷新
	private int state;
	private boolean isBack;

	private RotateAnimation animation;
	private RotateAnimation reverseAnimation;

	private boolean canReturn;
	private boolean isRecored;
	private int startY;
	private String down_str="下拉刷新";
	private String release_str="松开即可刷新";
	private Context mContext;
	private Handler mHandler ;

	public void setRefreshable(boolean refreshable){
		this.isRefreshable = refreshable;
	}
	
	public PullToRefreshListView(Context context) {
		super(context);
		init(context);
		this.setOnScrollListener(this);
	}

	
	public PullToRefreshListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
		this.setOnScrollListener(this);
	}

	private void init(Context context) {
		mContext = context;
		LayoutInflater inflater = LayoutInflater.from(context);
		mHandler = new Handler();

		headView = (LinearLayout) inflater.inflate(R.layout.head_view,
				null);
		arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);
		progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);
		tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);
		lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);
		mReleaseHintIcon = (ImageView) headView.findViewById(R.id.iv_release);
		measureView(headView);

		headContentHeight = headView.getMeasuredHeight();
		headContentWidth = headView.getMeasuredWidth();
		headView.setPadding(0, -1 * headContentHeight, 0, 0);
		headView.invalidate();

		CrashHandler.d("size", "width:" + headContentWidth + " height:"
				+ headContentHeight);

		addHeaderView(headView);

		animation = new RotateAnimation(0, -180,
				Animation.RELATIVE_TO_SELF, 0.5f,
				Animation.RELATIVE_TO_SELF, 0.5f);
		animation.setInterpolator(new LinearInterpolator());
		animation.setDuration(150);
		animation.setFillAfter(true);

		reverseAnimation = new RotateAnimation(-180, 0,
				Animation.RELATIVE_TO_SELF, 0.5f,
				Animation.RELATIVE_TO_SELF, 0.5f);
		reverseAnimation.setInterpolator(new LinearInterpolator());
		reverseAnimation.setDuration(150);
		reverseAnimation.setFillAfter(true);

		state = DONE;
		isRefreshable = false;
		canReturn = false;
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		boolean result = super.onTouchEvent(event);
		if (isRefreshable) {
			switch (event.getAction()) {
			case MotionEvent.ACTION_DOWN:
				if (getScrollY() == 0 && !isRecored) {
					isRecored = true;
					startY = (int) event.getY();
					CrashHandler.d(TAG, "在down时候记录当前位置‘");
				}
				break;
			case MotionEvent.ACTION_UP:
				boolean parentMotion = false;
				if (state != REFRESHING && state != LOADING) {
					if (state == DONE) {
						// 什么都不做
						parentMotion = true;
					}
					if (state == PULL_To_REFRESH) {
						state = DONE;
						changeHeaderViewByState();
						CrashHandler.d(TAG, "由下拉刷新状态，到done状态");
					}
					if (state == RELEASE_To_REFRESH) {
						state = REFRESHING;
						changeHeaderViewByState();
						onRefresh();
						CrashHandler.d(TAG, "由松开刷新状态，到done状态");
					}
				}
				isRecored = false;
				isBack = false;
				if(!parentMotion){
					return true;
				}
				break;
			case MotionEvent.ACTION_MOVE:
				int tempY = (int) event.getY();
				if (!isRecored && getScrollY() == 0) {
					CrashHandler.d(TAG, "在move时候记录下位置");
					isRecored = true;
					startY = tempY;
				}

				if (state != REFRESHING && isRecored && state != LOADING && PullToRefreshListView.this.getFirstVisiblePosition()==0) {
					// 可以松手去刷新了
					if (state == RELEASE_To_REFRESH) {
						canReturn = true;

						if (((tempY - startY) / RATIO < headContentHeight)
								&& (tempY - startY) > 0) {
							state = PULL_To_REFRESH;
							changeHeaderViewByState();
							CrashHandler.d(TAG, "由松开刷新状态转变到下拉刷新状态");
						}
						// 一下子推到顶了
						else if (tempY - startY <= 0) {
							state = DONE;
							changeHeaderViewByState();
							CrashHandler.d(TAG, "由松开刷新状态转变到done状态");
						} else {
							// 不用进行特别的操作，只用更新paddingTop的值就行了
						}
					}
					// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
					if (state == PULL_To_REFRESH) {
						canReturn = true;

						// 下拉到可以进入RELEASE_TO_REFRESH的状态
						if ((tempY - startY) / RATIO >= headContentHeight) {
							state = RELEASE_To_REFRESH;
							isBack = true;
							changeHeaderViewByState();
							CrashHandler.d(TAG, "由done或者下拉刷新状态转变到松开刷新");
						}
						// 上推到顶了
						else if (tempY - startY <= 0) {
							state = DONE;
							changeHeaderViewByState();
							CrashHandler.d(TAG, "由DOne或者下拉刷新状态转变到done状态");
						}
					}

					// done状态下
					if (state == DONE) {
						if (tempY - startY > 0) {
							state = PULL_To_REFRESH;
							changeHeaderViewByState();
						}
					}

					// 更新headView的size
					if (state == PULL_To_REFRESH) {
						headView.setPadding(0, -1 * headContentHeight
								+ (tempY - startY) / RATIO, 0, 0);

					}

					// 更新headView的paddingTop
					if (state == RELEASE_To_REFRESH) {
						headView.setPadding(0, (tempY - startY) / RATIO
								- headContentHeight, 0, 0);
					}
					if (canReturn) {
						canReturn = false;
						return true;
					}
				}
				break;
			}
		}
		return result;
	}

	// 当状态改变时候，调用该方法，以更新界面
	private void changeHeaderViewByState() {
		switch (state) {
		case RELEASE_To_REFRESH:
			arrowImageView.setVisibility(View.VISIBLE);
			progressBar.setVisibility(View.GONE);
			tipsTextview.setVisibility(View.VISIBLE);
//			lastUpdatedTextView.setVisibility(View.VISIBLE);

			arrowImageView.clearAnimation();
			arrowImageView.startAnimation(animation);

			tipsTextview.setText(release_str);

			CrashHandler.d(TAG, "当前状态，松开刷新");
			break;
		case PULL_To_REFRESH:
			progressBar.setVisibility(View.GONE);
			tipsTextview.setVisibility(View.VISIBLE);
//			lastUpdatedTextView.setVisibility(View.VISIBLE);
			arrowImageView.clearAnimation();
			arrowImageView.setVisibility(View.VISIBLE);
			// 是由RELEASE_To_REFRESH状态转变来的
			if (isBack) {
				isBack = false;
				arrowImageView.clearAnimation();
				arrowImageView.startAnimation(reverseAnimation);

				tipsTextview.setText(down_str);
			} else {
				tipsTextview.setText(down_str);
			}
			CrashHandler.d(TAG, "当前状态，下拉刷新");
			break;

		case REFRESHING:

			headView.setPadding(0, 0, 0, 0);

			progressBar.setVisibility(View.VISIBLE);
			arrowImageView.clearAnimation();
			arrowImageView.setVisibility(View.GONE);
			tipsTextview.setText("正在刷新...");
//			lastUpdatedTextView.setVisibility(View.VISIBLE);

			CrashHandler.d(TAG, "当前状态,正在刷新...");
			break;
		case DONE:
			headView.setPadding(0, -1 * headContentHeight, 0, 0);

			progressBar.setVisibility(View.GONE);
			arrowImageView.clearAnimation();
			arrowImageView.setImageResource(R.drawable.head_arrow);
			tipsTextview.setText(down_str);
//			lastUpdatedTextView.setVisibility(View.VISIBLE);

			CrashHandler.d(TAG, "当前状态，done");
			break;
		}
	}
	
	private void changeHeaderViewByStateForAddMore() {
		switch (state) {
		case RELEASE_To_REFRESH:
			arrowImageView.setVisibility(View.VISIBLE);
			progressBar.setVisibility(View.GONE);
			tipsTextview.setVisibility(View.VISIBLE);
//			lastUpdatedTextView.setVisibility(View.VISIBLE);

			arrowImageView.clearAnimation();
			arrowImageView.startAnimation(animation);

			tipsTextview.setText(release_str);

			CrashHandler.d(TAG, "当前状态，松开加载");
			break;
		case PULL_To_REFRESH:
			progressBar.setVisibility(View.GONE);
			tipsTextview.setVisibility(View.VISIBLE);
//			lastUpdatedTextView.setVisibility(View.VISIBLE);
			arrowImageView.clearAnimation();
			arrowImageView.setVisibility(View.VISIBLE);
			// 是由RELEASE_To_REFRESH状态转变来的
			if (isBack) {
				isBack = false;
				arrowImageView.clearAnimation();
				arrowImageView.startAnimation(reverseAnimation);

				tipsTextview.setText(down_str);
			} else {
				tipsTextview.setText(down_str);
			}
			CrashHandler.d(TAG, "当前状态，下拉加载");
			break;

		case REFRESHING:

			headView.setPadding(0, 0, 0, 0);

			progressBar.setVisibility(View.VISIBLE);
			arrowImageView.clearAnimation();
			arrowImageView.setVisibility(View.GONE);
			tipsTextview.setText("正在加载...");
//			lastUpdatedTextView.setVisibility(View.VISIBLE);

			CrashHandler.d(TAG, "当前状态,正在加载...");
			break;
		case DONE:
			headView.setPadding(0, -1 * headContentHeight, 0, 0);

			progressBar.setVisibility(View.GONE);
			arrowImageView.clearAnimation();
			arrowImageView.setImageResource(R.drawable.head_arrow);
			tipsTextview.setText(down_str);
//			lastUpdatedTextView.setVisibility(View.VISIBLE);

			CrashHandler.d(TAG, "当前状态，done");
			break;
		}
	}

	private void measureView(View child) {
		ViewGroup.LayoutParams p = child.getLayoutParams();
		if (p == null) {
			p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
					ViewGroup.LayoutParams.WRAP_CONTENT);
		}
		int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
		int lpHeight = p.height;
		int childHeightSpec;
		if (lpHeight > 0) {
			childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
					MeasureSpec.EXACTLY);
		} else {
			childHeightSpec = MeasureSpec.makeMeasureSpec(0,
					MeasureSpec.UNSPECIFIED);
		}
		child.measure(childWidthSpec, childHeightSpec);
	}

	public void setOnRefreshListener(OnRefreshListener refreshListener) {
		this.refreshListener = refreshListener;
		isRefreshable = true;
	}

	public interface OnRefreshListener {
		public void onRefresh();
	}

	/**
	 * Simple Listener that allows you to be notified when the user has scrolled
	 * to the end of the AdapterView. See (
	 * {@link PullToRefreshAdapterViewBase#setOnLastItemVisibleListener}.
	 * 
	 * @author Chris Banes
	 */
	public interface OnLastItemVisibleListener {

		/**
		 * Called when the user has scrolled to the end of the list
		 */
		public void onLastItemVisible();

	}
	
	public void onRefreshComplete() {
		state = DONE;
		lastUpdatedTextView.setText("最近更新:" + Tools.formatTimeStampString(
				mContext, 
				System.currentTimeMillis() / 1000, 
				false));
		mReleaseHintIcon.setVisibility(GONE);
		changeHeaderViewByState();
		invalidate();
		scrollTo(0, 0);
	}
	
	public void onRefreshSuccess(){
		isRefreshing = false;
		tipsTextview.setText("更新成功");
		progressBar.setVisibility(INVISIBLE);
		mReleaseHintIcon.setImageResource(R.drawable.refresh_success);
		mReleaseHintIcon.setVisibility(VISIBLE);
		mHandler.postDelayed(new Runnable() {
			
			@Override
			public void run() {
				onRefreshComplete();
			}
		}, REFRESH_HINT_APPEAR_MILLIS);
		
		CrashHandler.d(TAG, "Handler名字" + mHandler.getClass().getName());
	}
	
	public void onRefreshFail() {
//		state = DONE;
		tipsTextview.setText("更新失败");
		isRefreshing = false;
		progressBar.setVisibility(INVISIBLE);
		mReleaseHintIcon.setImageResource(R.drawable.refresh_failed);
		mReleaseHintIcon.setVisibility(VISIBLE);
		mHandler.postDelayed(new Runnable() {
			
			@Override
			public void run() {
				onRefreshComplete();
			}
		}, REFRESH_HINT_APPEAR_MILLIS);
	}
	public void onAddMoreFail() {
//		state = DONE;
		tipsTextview.setText("加载失败");
		isRefreshing = false;
		progressBar.setVisibility(INVISIBLE);
		mReleaseHintIcon.setImageResource(R.drawable.refresh_failed);
		mReleaseHintIcon.setVisibility(VISIBLE);
		mHandler.postDelayed(new Runnable() {
			
			@Override
			public void run() {
				onRefreshComplete();
			}
		}, REFRESH_HINT_APPEAR_MILLIS);
	}
	

	public void onRefreshLatest(){
		tipsTextview.setText("当前已是最新");
		progressBar.setVisibility(INVISIBLE);
		mReleaseHintIcon.setImageResource(R.drawable.refresh_success);
		mReleaseHintIcon.setVisibility(VISIBLE);
		mHandler.postDelayed(new Runnable() {
			
			@Override
			public void run() {
				onRefreshComplete();
			}
		}, REFRESH_HINT_APPEAR_MILLIS);
	}
	
	public void onRefreshNullNet(){
		tipsTextview.setText(Define.MSG_NO_NETWORK);
	}
	
	public void onAddMoreComplete() {
		state = DONE;
		lastUpdatedTextView.setText("最近加载:" + Tools.formatTimeStampString(
				mContext, 
				System.currentTimeMillis() / 1000, 
				false));
		mReleaseHintIcon.setVisibility(GONE);
		changeHeaderViewByStateForAddMore();
		invalidate();
		scrollTo(0, 0);
	}
	
	public void onAddMoreLatest(){
		tipsTextview.setText("当前已无更多数据");
		progressBar.setVisibility(INVISIBLE);
		mReleaseHintIcon.setImageResource(R.drawable.refresh_success);
		mReleaseHintIcon.setVisibility(VISIBLE);
	}
	
	public void onAddMoreSuccess(){
		isRefreshing = false;
		tipsTextview.setText("加载成功");
		progressBar.setVisibility(INVISIBLE);
		mReleaseHintIcon.setImageResource(R.drawable.refresh_success);
		mReleaseHintIcon.setVisibility(VISIBLE);
	}
	
	public void autoRefresh(){
		state = REFRESHING;
//		isRefreshing = true;		
		changeHeaderViewByState();
		invalidate();
	}

	public void setDownStr(String s){
		down_str=s;
	}
	public void setReleaseStr(String s){
		release_str=s;
	}
	
	private void onRefresh() {
		isRefreshing = true;
		if (refreshListener != null) {
			refreshListener.onRefresh();
		}
	}

	public void addChild(View child) {
		innerLayout.addView(child);
	}

	public void addChild(View child, int position) {
		innerLayout.addView(child, position);
	}

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
//		if (Define.DEBUG) {
//			Log.d(TAG, "First Visible: " + firstVisibleItem + ". Visible Count: " + visibleItemCount
//					+ ". Total Items:" + totalItemCount);
//		}

		/**
		 * Set whether the Last Item is Visible. lastVisibleItemIndex is a
		 * zero-based index, so we minus one totalItemCount to check
		 */
		if (null != mOnLastItemVisibleListener) {
			mLastItemVisible = (totalItemCount > 0) && (firstVisibleItem + visibleItemCount >= totalItemCount - 1);
		}
	}
	
	public final void setOnLastItemVisibleListener(OnLastItemVisibleListener listener) {
		mOnLastItemVisibleListener = listener;
	}

	//private int getLastVisiblePosition = 0;
	//private int lastVisiblePositionY = 0;
	
	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		/**
		 * Check that the scrolling has stopped, and that the last item is
		 * visible.
		 */
		if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && null != mOnLastItemVisibleListener && mLastItemVisible) {
			mOnLastItemVisibleListener.onLastItemVisible();
			// 滚动到底部
//			if (view.getLastVisiblePosition() == (view.getCount() - 1)) {
//				View v = (View) view.getChildAt(view.getChildCount() - 1);
//				int[] location = new int[2];
//				v.getLocationOnScreen(location);// 获取在整个屏幕内的绝对坐标
//				int y = location[1];
//
//				Log.d("x" + location[0], "y" + location[1]);
//				if (view.getLastVisiblePosition() != getLastVisiblePosition
//						&& lastVisiblePositionY != y) {
//					getLastVisiblePosition = view.getLastVisiblePosition();
//					lastVisiblePositionY = y;
//					return;
//				} else if (view.getLastVisiblePosition() == getLastVisiblePosition
//						&& lastVisiblePositionY == y) {
//					mOnLastItemVisibleListener.onLastItemVisible();
//				}
//
//				// 未滚动到底部，第二次拖至底部都初始化
//				getLastVisiblePosition = 0;
//				lastVisiblePositionY = 0;
//			}
		}
	}


	public boolean isRefreshing() {
		return isRefreshing;
	}
	
	public void setHeadViewBackground(int resId){
		headView.setBackgroundResource(resId);
	}
	
}
